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(NoModelA 4 E. N. DIGKERSON, J1".

SYSTEM OF ELECTRICAL DISTRIBUTION. No. 396,549. Patented Jan. 22, 1889.

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UNITED STATES PATENT OErrcE.

EDlYARI) X. DICKERSON, JR., OF NEXY YORK, X. Y.

SYSTEM OF ELECTRlCAL DISTRIBUTiON.

SPECIFICATION forming part of Letters Patent No. 896,519, dated January 22, 1889.

Application filed November '7, 1887. Serial No. 254,565- (No model.)

To all whom it may concern:

' Be it known that I, EDWARD N. DICKER- sON, J12, of the city, county, and State of New York, have invented a new and useful Improvement in a System of Electrical Conversion, of which the following is a full, true, and exact description, reference being had to the accompanying drawings.

My invention relates to an improvement in a system of electrical conversion for which I have obtained Letters of the United States, February 1i, 1888, No. 377,994, in which a system is shown by which a direct high-tension current can be converted into an alternating low-tension current at the point where it is desired to utilize the same. By my present system I am enabled to convert a direct high-tension current at the point of conversion into a direct low-tension current.

My apparatus consists, generally, of the same apparatus shown in my said prior pat ent.

My invention will be readily understood from the accompanying drawings, in which similar letters refer tosimilar parts.

Figure 1 represents a view of the main circuit system; Fig. 2, a detailed view of the commutator.

A higlrtension current tlows out upon the circuit a and returns to the generator by the circuit 75. By the switch L it passes to the spring M; thence by the circuit 1) c p 72 it it passes through the motor (1, which is operated by its own commutator P, in the usual manner. On the shaft of this motor is arranged the double reversing-commutator B B, the sections of which are alternately connected, as shown, one set of sections being connected with the circuit (1 and the other with the circuit g. The commutator-springs are made just broad enough to lap two sections, so as to prevent the breaking of the current, and these comnmt-ator-springs H H connect with the circuits c which go to the lVestinghouse converter D.

In the drawings the lap of the springs H is shown greater than need be. It is sutiicient that the contact of these springs be simply great enough to span the insulation. It is obvious that other forms of reversing-commutator could be employed.

It is obvious that the current upon the circuits e f is a high-tension reversing-current, and therefore will operate the converter D, which further converts a reversing hightension current into a reversing low-tension current, which passes out in the secondary circuit n o and may be used to light the incan descent light K. This converter and motor are supposed to be located together, by preference without a house, and the circuit a 0 enters the house.

A switch, E F, puts the apparatus in operation. If the switch be held to the le." by the magnet E, the high-tension current passes directly by the switch L, spring N, to the'circuit it without passing into the apparatus. Under these circumstances a second current is sent through the wire Z to ground G. If this second current is sent through the wire in to ground G, then the switch L is thrown against spring M, and then the current passes by the wire a to the junction between I) and c. The resistance of the motor A, which acts as a shunt-resistance, forces the desired proportion of current by the wire (I, through the reversing-switch, the circuit 6 and f, and circuit g, back to the generator. In case it is not desired to use this shunt device the motor can be operated by an independent current entering by the wires p c, which would then be disconnected from the main circuit. The difference between these two arrangements is one of economy merely, two circuits being required in the latter case.

It is obvious, of course, that the switch E F may be omitted; but by it I am enabled to throw any house into circuit from the central office.

Upon the circuits c f an alternating current is discharged, which passes through a primary coil of the converter D. From this an niduced alternating current proceeds upon the circuits n 0, which lead to the reversing commutator J K, which may be, of course, of any desired form, and I show it merely of the form indicated for convenience in explanation. By this reversing-connnutator the re versing currents coming in upon the circuits n 0 are rectified and pass out upon the circuit 5 t, where they are employed to do the work required. It is important for plating pur poses and for running motors that the current shall not be reversing. It is of course essential that the two connnutators shall move synchronously, and the commutator .l K should be so adjusted on the shaft as to allow for the time required by the com'erter D.

The peculiar arrangement shown prevents substantial sparking on the eommutators. It will be observed that the time of reversal on the commutator J K is substantially synchronous with the time of reversal of the commutator B B, and therefore at a time of practically no current.

I do not in this specification claim the specific apparatus shown, intending to make a separate application therefor.

lVhat I claim as in Y invention and desire main generator, in causing the said reversed current to flow through a converter, thereby producing a series of secondary reversing currents, and in rectifying said currents through a second reversing-commutator moving synchronously with the first commutator, substantially as described.

2. The system of electrical conversion herein described, which consists in causing a direct current to flow upon a main circuit and through a current-reverser in reversing a subordinate circuit supplied from the main circuit, in converting the said reversing-circuit into a circuit of different tension by means of a converter, and in again straightening Faid converted circuit by a reversing-comm n tator moving synchronously with the commutator which reverses the primary circuit, substantially as described.

E. N. DIOKERSON, JR. Witnesses:

ANTHONY GREF, WM. A. POLLOCK. 

